package com.guxiuwei.filter;

import com.guxiuwei.sys.entity.LoginUser;
import com.guxiuwei.utils.JwtUtil;
import com.guxiuwei.utils.RedisCache;
import io.jsonwebtoken.Claims;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
                String url = request.getRequestURL().toString();
        if (org.apache.commons.lang3.StringUtils.substringBeforeLast(url,"/").equals("http://localhost:8081/sys/aporder/getFiles")){
                filterChain.doFilter(request, response);
            }else if (org.apache.commons.lang3.StringUtils.substringBeforeLast(url,"/").equals("http://localhost:8081/sys/leaves/getFiles")){
            filterChain.doFilter(request, response);
        }

            //获取token
            String token = request.getHeader("token");
            if (!StringUtils.hasText(token)) {
                //放行
                filterChain.doFilter(request, response);
                return;
            }
            //解析token
            String userid;
            try {
                Claims claims = JwtUtil.parseJWT(token);
                userid = claims.getSubject();
                String refreshedToken = JwtUtil.refreshToken(token);
                response.setHeader("token", refreshedToken);
            } catch (Exception e) {
                e.printStackTrace();
                throw new RuntimeException("token非法");
            }

            //从redis中获取用户信息
            String redisKey = "login:" + userid;
            LoginUser loginUser = redisCache.getCacheObject(redisKey);
            if (Objects.isNull(loginUser)) {
                throw new RuntimeException("用户未登录");
            }
            //存入SecurityContextHolder
            //TODO 获取权限信息封装到Authentication中
            UsernamePasswordAuthenticationToken authenticationToken =
                    new UsernamePasswordAuthenticationToken(loginUser, null, loginUser.getAuthorities());
            SecurityContextHolder.getContext().setAuthentication(authenticationToken);
            //放行
            filterChain.doFilter(request, response);
        }
    }

